Answer
$$7a(a^3-2a^2+5)=7a^4-14a^3+35a$$
Explanation
| $$ \begin{aligned}7a(a^3-2a^2+5)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7a^4-14a^3+35a\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{7a} $ by $ \left( a^3-2a^2+5\right) $ $$ \color{blue}{7a} \cdot \left( a^3-2a^2+5\right) = 7a^4-14a^3+35a $$ |
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